Best way to remove thousand separators from string amount using a regex

Question

I have variables that contain amounts and would like to remove the (US) thousand separators but also have to cover the scenario that there may be non-US formatted amounts wh

Answer 1

You can use replace() method to remove all the commas. They will be replaced with an empty string. I'm using reg exp with lookahead assertion to detect if a comma is followed by three digits, if so given comma will be removed.

string.replace(/,(?=\d{3})/g, '')

Examples:

'12,345,678.90'.replace(/,(?=\d{3})/g, '')
// '12345678.90'

'1,23,456.78'.replace(/,(?=\d{3})/g, '')
// '1,23456.78'

'$1,234.56'.replace(/,(?=\d{3})/g, '')
// '$1234.56'